The Steamship Authority has announced the following service changes:

On August 19, the last two scheduled trips into and out of Oak Bluffs will be diverted to Vineyard Haven due to the Ocean Park fireworks.

The specific trips affected are: the 6:30 p.m. departure from Woods Hole with 7:30 p.m. return on board the M/V Nantucket and he 7:30 p.m. departure from Woods Hole with 8:30 p.m. return on board the M/V Martha’s Vineyard.

On August 21, the 50th running of the Falmouth Road Race will affect operations on the Vineyard route. While no trips are canceled on Sunday, access to the Woods Hole terminal via Woods Hole Road will be limited until 8 a.m. and closed completely from 8 a.m. until about 10 a.m., or until the last runner is out. Customers should expect travel delays along Woods Hole Road and Palmer Avenue all day as a result of the race.

The following trips will be affected by the road closures:

The 6:30 a.m. trip from Woods Hole will leave at 6:20 a.m. and arrive in Oak Bluffs at 7:05 a.m.

Customers departing Woods Hole must arrive at the terminal no later than 8 a.m. if they are on one of the following trips with a vehicle or if they are trying to travel as a passenger: 8:15 a.m., arriving 9 a.m. in Vineyard Haven; 8:35 a.m., arriving 9:20 a.m. in Oak Bluffs; 9:30 a.m., arriving 10:15 a.m. in Oak Bluffs and 9:50 a.m., arriving 10:35 a.m. in Vineyard Haven.

All inbound vehicles will be stopped at Woods Hole Road and Harbor Hill Road to be screened by the Falmouth Police Department. Vehicles without a Steamship Authority vehicle reservation will be denied access to the ferry terminal.

The last bus to the terminal will leave the Thomas B. Landers Road lot at 7:25 a.m. The last bus from the Palmer Avenue lot will leave at 7:40 a.m.

The 7:30 a.m. trip from Oak Bluffs will leave at 7:15 a.m. and arrive at 8 a.m. Traffic on this trip will be allowed to leave the Woods Hole terminal.

Customers departing Martha’s Vineyard on the following trips will not be able to leave the Woods Hole Terminal property until the roads reopen:

8:15 a.m., arriving 9 a.m. in Woods Hole; 8:35 a.m., arriving 9:20 a.m. in Woods Hole; 9:30 a.m., arriving 10:15 a.m. in Woods Hole.

Customers can visit steamshipauthority.com/FalmouthRoadRace for more information.